JP2001199230A - Temperature expansiion valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve installing performance by forming an external shape by installing a cover on a temperature expansion valve used for a vehicular air conditioner. SOLUTION: This temperature expansion valve 100 has a valve chest in a valve body 110 to control a flow rate of a refrigerant from a condenser and a receiver to be sent to an evaporator from a passage 132. The refrigerant returned from the evaporator transmits a temperature of the refrigerant to a temperature sensing bar connected to a power element part 36 while passing through a passage 34. A cover 200 has a head part 220 and a taper part 210, and is installed in an upper part of the valve body 110. A taper outside surface 212 of the taper part 210 of the cover 200 and a taper surface 114 of the valve body 110 form the almost same plane. A recessed part 221 of the head part 220 covers the power element part 36, and a top part forms a curved surface 222.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature expansion valve used in a refrigeration cycle.

[0002]

2. Description of the Related Art In general, in an air conditioner for a vehicle, an evaporator among components constituting a refrigeration cycle is disposed in a vehicle compartment, and other compressors and the like are disposed in an engine room. This refrigeration cycle is also provided with a temperature expansion valve for controlling the amount of refrigerant flowing into the evaporator.

FIG. 26 is a longitudinal sectional view showing a state in which a box-type expansion valve is arranged in a refrigeration cycle of an air conditioner for a vehicle as a conventional expansion valve, and FIG. 27 is a schematic perspective view thereof. In FIG. 26, an expansion valve 10 has a prismatic valve body 30 made of, for example, aluminum and a refrigeration cycle 11.
At the condenser 5 and the receiver 6 to the evaporator 8
Passage 32 through which the refrigerant flows toward the compressor 4 and second passage 3 through which the refrigerant flows from the evaporator 8 to the compressor 4
4 are formed on the valve body 30 so as to be vertically separated from each other. Further, an orifice 32a and a valve chamber 35 provided in the first passage 32, and a spherical valve body 32 disposed upstream of the passage 32 for controlling the amount of refrigerant passing through the orifice 32a.
b and the valve element 32b in the direction of the orifice 32a.
c has an adjusting screw 39 for the spring 32d which presses through the c. An adjusting screw 39 having a screw portion 39f is screwed from a lower end surface of the valve body 30 into a mounting hole 30a communicating with the valve chamber 35 of the first passage 32 so as to be able to advance and retreat.
9 g is mounted on the adjusting screw 39, and an airtight state with the valve body 30 is secured. The adjusting screw 39 and the pressing spring 32d
Thus, the opening degree of the valve body 32d with respect to the orifice 32a is adjusted.

[0004] Reference numeral 321 denotes an inlet port through which the refrigerant sent out from the receiver 6 and flowing toward the evaporator 8 flows, and the valve chamber 35 is continuous with the inlet port 321.
322 is an outlet port for the refrigerant flowing into the evaporator 8. In FIG. 27, reference numeral 50 denotes a bolt hole for mounting the expansion valve, and the lower part of the valve body 30 is thinned. The valve body 30 has a small hole 37 for applying a driving force to the valve body 32b in accordance with the outlet temperature of the evaporator 8 to open and close the orifice 32a.
A hole 38 having a larger diameter is formed coaxially with the orifice 32a, and a screw hole 361 is formed at the upper end of the valve body 30 to which the power element portion 36 serving as a heat-sensitive portion is fixed.

[0005] The power element portion 36 includes, for example, a diaphragm 36a made of stainless steel and a diaphragm 3a.
Upper pressure working chamber 3 which is provided in close contact with each other by welding and sandwiches 6a and forms two airtight temperature sensing chambers above and below it.
6b and the lower pressure working chamber 36c.
For example, an upper cover 36d and a lower cover 36h made of stainless steel, and a stopper 36k for sealing a predetermined refrigerant serving as a diaphragm driving fluid in the upper pressure working chamber 36b are provided.
Is screwed into the screw hole 361 via the packing 40. The lower pressure working chamber 36c communicates with the second passage 34 via a pressure equalizing hole 36e formed concentrically with the center line of the orifice 32a. The refrigerant from the evaporator 8 flows through the second passage 34, and the passage 34 serves as a passage for the gas-phase refrigerant, and the pressure of the refrigerant is applied to the lower pressure working chamber 36c via the equalizing hole 36e. In addition, 342 is an inlet port into which the refrigerant sent from the evaporator 8 enters,
An outlet port 341 serves as an outlet for the refrigerant sent to the compressor 4.

Further, the lower pressure working chamber 36c has a large-diameter dish-shaped top 312 in contact with the center of the lower surface of the diaphragm 36a, and the large-diameter hole 38 penetrates through the second passage 34. And slidably disposed therein, to transmit the refrigerant outlet temperature of the evaporator 8 to the lower pressure operating chamber 36c, and also to transmit the refrigerant pressure to the upper pressure operating chamber 36b and the lower pressure operating chamber 36c.
The aluminum temperature sensing rod 3 that slides in the large diameter 38 to provide a driving force in accordance with the displacement of the diaphragm 36a due to the pressure difference
6f and a smaller diameter than the temperature sensing rod 36f which is slidably disposed in the small diameter hole 37 and presses the valve body 32b against the elastic force of the urging means 32d according to the displacement of the temperature sensing rod 36f. Of the stainless steel operating rod 37f. The temperature sensing rod 36f has an upper end formed by a top 312 serving as a receiving portion of the diaphragm 36a and a large diameter portion 314 that slides in the lower pressure working chamber 36c, and a lower end of the temperature sensing rod 36f is formed by the working rod 37f. The lower end of the operating rod 37f is in contact with the valve element 32b, and the temperature-sensitive rod 36f and the operating rod 37f are in contact with the valve element driving rod 31.
8 are configured. The top 312 and the large diameter portion 314
May be integrally configured.

Therefore, the orifice 32 of the first passage 32 is inserted into the pressure equalizing hole 36e from the lower surface of the diaphragm 36a.
The valve body drive rod 318 extending to a is concentrically arranged. The portion 37e of the operating rod 37f
Is formed thinner than the inner diameter of the orifice 32a, passes through the orifice 32a, and the refrigerant passes through the orifice 32a. In addition, the first passage 32 is provided in the temperature sensing rod 36f,
An O-ring 36g is provided as a sealing member for ensuring airtightness with the second passage 34.

The upper pressure working chamber 36b of the pressure working housing 36d is filled with a known diaphragm driving fluid, and the diaphragm driving fluid is uniformly communicated with the second passage 34 and the second passage 34. The heat of the refrigerant from the refrigerant outlet of the evaporator 8 flowing through the second passage 34 is transmitted through the valve body driving rod 318 and the diaphragm 36a exposed to the pressure hole 36e.

[0009] The diaphragm driving fluid in the upper pressure working chamber 36b is gasified in response to the transferred heat, and applies pressure to the upper surface of the diaphragm 36a. The diaphragm 36a is displaced up and down due to the difference between the pressure of the diaphragm driving gas applied to the upper surface and the pressure applied to the lower surface of the diaphragm 36a. The displacement of the center of the diaphragm 36a up and down is transmitted to the valve body 32b via the valve body drive rod, and makes the valve body 32b approach or separate from the valve seat of the orifice 32a. As a result, the flow rate of the refrigerant is controlled.

That is, since the temperature of the low-pressure gas-phase refrigerant sent from the outlet side of the evaporator 8, that is, from the evaporator, is transmitted to the upper pressure working chamber 36b, the pressure of the upper pressure working chamber 36b changes according to the temperature. Evaporator 8
Outlet temperature rises. That is, when the heat load of the evaporator increases, the pressure of the upper pressure working chamber 86b increases,
Accordingly, the temperature sensing rod 36f, that is, the valve body drive rod is driven downward to lower the valve body 32b, so that the opening degree of the orifice 32a increases. Thus, the supply amount of the refrigerant to the evaporator 8 increases, and the temperature of the evaporator 8 decreases. Conversely, the temperature of the refrigerant sent from the evaporator 8 decreases. That is, when the heat load of the evaporator decreases, the valve element 32b is driven in the opposite direction to the above, the opening degree of the orifice 32a decreases, the supply amount of the refrigerant to the evaporator decreases, and the temperature of the evaporator 8 increases. .

In such a conventional temperature expansion valve, the temperature sensing rod 36f is a member having a relatively large diameter, and this member and the operating rod constitute a valve body driving rod. Thus, there is also a conventional temperature expansion valve in which the valve body driving rod is constituted by a rod member,
A conventional temperature expansion valve 10 'using this rod member is shown in FIG.
FIG. The operation of the expansion valve shown in FIG.
7 and the same reference numerals as those in FIGS. 26 and 27 indicate the same or equivalent parts.

A temperature sensing portion 318 having a temperature sensing mechanism acts as a temperature sensing rod 361f, and a large diameter stopper portion 312 serving as a receiving portion of the diaphragm 36a when the diaphragm 36a contacts the surface thereof, and a stopper portion 312 of the stopper portion 312. A large-diameter portion 314 having one end surface in contact with the back surface and a center portion of the other end surface formed in a projection 315 and slidably inserted into the lower pressure working chamber 36c; and a projection of the large-diameter portion 314 A portion 37 in which one end face is fitted inside 315 and the other end face corresponds to the operating rod
And a rod member 316 of an integral structure which is in contact with the valve body 32b via 1f and is continuous. The temperature sensing rod 361f constituting the rod member 316 is exposed in the second passage, and heat from the refrigerant vapor is transmitted.

A rod member 361 which is a temperature sensing rod 361f
Is driven to move back and forth across the passage 34 in accordance with the displacement of the diaphragm 36a of the power element portion 36, so that a clearance (gap) communicating between the passage 32 and the passage 34 along the rod portion 316 is formed. That means
In order to prevent this communication, an O-ring 42 which is in close contact with the outer periphery of the rod portion 316 is arranged in the large-diameter hole 38 'so that the O-ring exists between both passages. A push nut 41 is used as a detent nut as a detent nut to prevent the coil spring 32 d and the refrigerant pressure in the passage 321 from moving in response to the force acting in the longitudinal direction (the direction in which the power element portion 36 exists) due to the refrigerant pressure.
2 and is attached to the rod portion 316 so as to be disposed in the large-diameter hole 38 ′ in contact with the rod portion 316.

Various arrangements and support structures for such conventional thermal expansion valves have been proposed. That is,
An opening is provided in the partition that separates the engine room and the cabin, a temperature expansion valve is located on the cabin side of this opening, and a refrigerant pipe for supplying refrigerant to the evaporator is connected to the temperature expansion valve via a block-shaped connector. A structure has been proposed in which the connector is connected and the connector is supported in the opening via a packing material (for example,
JP-A-7-223427 and JP-A-7-3772.
No. 9). Further, the temperature expansion valve itself is supported at the opening via a packing material (for example, see Japanese Patent Application Laid-Open No. 7-21 / 1995).
A structure has been proposed.

[0015]

However, the above-mentioned structure for supporting the thermal expansion valve is uneconomical in terms of parts cost and assembly cost in that the connector and the packing are used, and also requires the use of the packing material. When the thermal expansion valve is directly supported by the thermal expansion valve, there is a problem that a gap may be formed between the inner wall of the opening and the thermal expansion valve, and the sealing may be insufficient. Moreover, in the conventional temperature expansion valve, no consideration has been given to the shape of supporting the temperature expansion valve of the automotive air conditioner itself at the opening of the partition wall.
That is, since the upper lid constituting the power element portion of the temperature expansion valve has a dome shape and has a plug protruding from the wall portion of the upper lid, adhesion to the inner wall of the opening becomes a problem, and the outer shape of the power element portion is reduced. The shape was not considered. Therefore, an object of the present invention is to provide a temperature expansion valve that supports a temperature expansion valve with good adhesion to an opening provided in a partition wall that partitions between an engine room and a vehicle compartment, and that can reliably seal the temperature expansion valve.

[0016]

To achieve the above object, a thermal expansion valve according to the present invention comprises a valve body and a power supply provided at an upper end of the valve body for driving a valve body in accordance with displacement of a diaphragm. An element portion, and an adjusting screw provided at a lower end portion of the valve body for adjusting a pressing force of a spring for adjusting a valve opening of the valve body, wherein the power element portion is a cover provided surrounding the same. And the lower part of the valve body is formed as a tapered surface.

In the temperature expansion valve of the present invention, a first flow path through which the refrigerant fed into the evaporator passes and a second flow path through which the refrigerant fed from the evaporator passes are formed in the valve body. The valve body disposed opposite the orifice formed in the middle of the first flow path is urged in the valve closing direction by a spring, and operates by sensing the temperature of the refrigerant passing through the second flow path. The temperature expansion valve in which the valve element is urged in the valve opening direction via a rod by the power element to be controlled, thereby controlling the valve opening, is provided with a cover provided around the power element. In addition, the lower part of the valve body where the spring exists is formed in a tapered surface.

In a preferred embodiment of the thermal expansion valve of the present invention, the cover has a concave portion formed inside, a curved surface and a tapered surface continuous with the curved surface formed outside, and the power element is formed in an upper concave portion. And the tapered surface is provided substantially continuously with the tapered surface of the valve body.

Further, in a specific embodiment of the thermal expansion valve of the present invention, the tapered surface of the valve body is formed substantially at the center of the entire height of the valve body. Further, as a specific embodiment of the temperature expansion valve of the present invention,
The valve body has an outer shape including a surface parallel to each other and a tapered surface tapering toward a bottom surface provided with a continuous adjustment screw from an upper surface on which the power element portion is provided to a substantially central portion of the entire height thereof. It is characterized by being formed in.

According to the present invention constructed as described above, since the valve body is formed of the parallel surface and the tapered surface, the valve body is easily brought into close contact with the partition and the mounting property is improved. Further, since the outer shape of the power element portion can be shaped by the cover provided on the power element portion, the adhesion to the opening of the partition wall is good, and the sealing property is good.

[0021]

1 to 6 show an embodiment of a temperature expansion valve according to the present invention. FIG. 1 is a front view and FIG.
3 is a left side view, FIG. 3 is a right side view, FIG. 4 is a rear view, FIG. 5 is a top view, and FIG. 6 is a bottom view. In the present invention, the same operation as that of the conventional temperature expansion valve is performed, and only the outer shape of the valve body is different from that of the conventional temperature expansion valve. Reference numerals are used, and description of the portions described in the description of the conventional example is omitted. The temperature expansion valve generally denoted by reference numeral 100 has a valve body 110 made of, for example, an aluminum alloy. The power element 36 described above is attached to the top of the valve body 110, and the diaphragm in the power element 36 is a temperature sensing rod 361f.
Activate

An inlet port 321 of the first passage 32 for the refrigerant supplied via a condenser and a receiver is provided on one side near the bottom 116 of the valve body 110. The introduced refrigerant passes through an orifice whose opening degree is controlled by the temperature sensing rod 361f, and flows from the outlet port 322 provided on the other side of the valve body 110 to the evaporator. The refrigerant discharged from the evaporator passes through the second passage 34 provided on the power element 36 side of the valve body 110. During this time, the temperature of the refrigerant is transmitted to the diaphragm via the temperature sensing rod 361f.

Two through holes 50 are formed in the valve body 110 in parallel with the axis of the second passage 34. This through hole 5
0 is used for the passage of a rod or the like for fixing the body to another member. On one side surface of the valve body 110, a screw hole 152 having a bottom is provided in parallel with the through hole 50, and a tightening bolt or the like is screwed therein.

The side surfaces 112 of the valve body 110 parallel to the axis of the refrigerant passage 140 are parallel to each other from the top surface where the power element 36 is mounted to the bottom surface 116 to almost the center of the entire height of the valve body 110. It consists of. Then, from the center of the main body toward the bottom surface 116,
It is formed on a tapered tapered surface 114 that is continuous with the parallel surface. The nut member 39 for sealing the valve chamber described above is attached to the bottom surface 116 of the valve body 110.

According to the thermal expansion valve of the present invention, since the valve body is formed of a parallel surface and a tapered surface that is continuous with the parallel surface, the valve body is easily brought into close contact with the partition wall, and the mountability is improved. Next, an embodiment of the present invention in which the temperature expansion valve of the present invention is attached to the partition will be described.

FIG. 7 is a front view of the temperature expansion valve shown in the embodiment of FIGS. 1 to 6 with a cover attached to the outside of the valve body, FIG. 8 is a left side view, and FIG. 10 is a right side view, FIG. 10 is a rear view, FIG. 11 is a top view, and FIG. 12 is a bottom view, which correspond to FIGS. In the drawing, a cover indicated generally by reference numeral 200 is made of, for example, a plastic resin. The cover 200 includes a head portion 220 having a concave portion 221 for accommodating the power element portion 36 formed therein, and a tapered portion 210 covering the outside of a parallel surface of the thermal expansion valve 110. The recess 221 accommodates the power element 36 and the power element 3
6 comes into contact with the outer peripheral edge. Therefore, the outer shape of the power element 36 can be shaped by the cover 200. The outer surface 212 of the tapered portion 210 is formed as a tapered surface that forms substantially the same plane as the tapered surface 114 of the valve body 110 of the thermal expansion valve. Tapered part 21
The inner surface 214 of the zero fits into the parallel surface of the valve body 110.

The outer surface 222 of the head 220 of the cover 200
Is formed with a curved surface. Therefore, the thermal expansion valve to which the cover 200 is attached has a side shape as shown in FIGS. Further, the end face 224 of the head 220 viewed from the front.
Protrudes from the expansion valve body and covers the entire power element portion 36. The end face 224 is in contact with the expansion valve body at a plane 226 that is orthogonal. As described above, since the temperature expansion valve of the present invention is configured to have an outer shape formed of the tapered surface and the outer peripheral surface of the curved surface, it is possible to improve the adhesion between the temperature expansion valve and the mounting portion. Become.

FIG. 13 is a perspective view of the cover 200.
The cover 200 is divided into two parts, for example, and is attached to the temperature expansion valve. The division surface is fixed by an appropriate means such as an adhesive or a fastener. With such a cover 200,
Since the concave portion is simply inserted into the power element and the outer peripheral edge of the power element is brought into contact with the power element, the sealing performance between the cover and the thermal expansion valve can be improved, and the mounting performance can be improved.

FIG. 14 shows a temperature expansion valve according to the present invention, for example, a partition wall 500 for separating an engine room and a cabin of an automobile.
15 is a side view showing a state of being attached to the opening 501 formed in FIG. 15, and FIG. 15 is a front view. Partition wall 5 made of metal plate
With respect to the opening 501 serving as an attachment portion formed at 00,
The cover 20 is provided via a sealing member 510 which is a packing material.
The temperature expansion valve 100 with 0 is held. The refrigerant pipes 600 and 610 are connected to the main body of the temperature expansion valve by a bracket 620.

The front shape of the temperature expansion valve to which the cover 200 is attached has a shape substantially surrounded by a tapered surface and a curved surface.
And the opening can be closed with good sealing properties. Therefore, the space between the engine room and the vehicle compartment is securely sealed.

In the above description, the case where the cover 400 is divided and attached to the temperature expansion valve 100 has been described. However, the present invention is not limited to this. It is needless to say that the present invention can be applied to a case where the cover is attached to the temperature expansion valve. 16 to 23 show another embodiment of the present invention in that case. The configuration of the temperature expansion valve is the same as that of FIGS. 1 to 6, and the same parts are denoted by the same reference numerals and description thereof will be omitted. Omitted. FIG. 16 is a front view of the thermal expansion valve showing an embodiment in which a cover is attached to the thermal expansion valve 100, FIG. 17 is a left side view, FIG. 18 is a right side view, and FIG. ,
20 is a top view, FIG. 21 is a bottom view, FIG. 22 is a perspective view of the cover, and FIG. 23 is a perspective view of the cover as viewed from the direction of arrow R in FIG. In the drawing, a cover indicated by reference numeral 400 is integrally made of, for example, a plastic resin.

The main body 410 of the cover 400 is
2 and a head 422, the outer surface of both sides 412 is a tapered surface, and the inner surface is a flat surface 4 that contacts the main body of the thermal expansion valve 100.
14 is formed. The outer surface of the head 422 is formed in a curved surface, and inside the power element 36 of the thermal expansion valve, is formed.
Are formed. Along these recesses 424 and 426, the power element 3
6 is inserted, and the cover 400 is attached to the thermal expansion valve 100. The depth of the recesses 424 and 426 is selected in consideration of the position where the power element 36 is accommodated when the cover 400 is placed on the power element 36.

Inner surface 4 of both sides 412 of cover body 410
A protruding portion 416 is formed at the rear end of 14. Therefore, when the cover 400 is attached to the temperature expansion valve 100, the expansion valve main body 110 abuts on the protrusion 416 and is positioned. An arc-shaped notch 418 is formed at the lower end of the protrusion 416. This notch 418
Are provided to avoid interference with the mounting bolt holes 50 provided in the temperature expansion valve main body 110.
Further, in the cover 400 shown in FIGS. 22 and 23, the end face 22 formed in the cover 200 of FIG.
4 is not provided, and a part of the power element portion 36 is exposed from the concave portion 426 as shown in FIG.

FIG. 24 is a side view showing a state in which the thermal expansion valve 100 with the cover 400 is attached to, for example, an opening formed in a partition wall 500 for separating an engine room and a vehicle compartment of an automobile, and FIG. Since the configuration is the same as that described with reference to FIGS. 14 and 15, the same portions are denoted by the same reference numerals and description thereof will be omitted.

[0035]

As described above, according to the present invention, the shape of the outer peripheral edge of the power element can be shaped by covering the temperature expansion valve used in the refrigeration cycle of the car air conditioner or the like with the cover. Therefore, when this temperature expansion valve is installed in a partition wall or the like between the engine room and the vehicle compartment of the vehicle, it is possible to realize a temperature expansion valve that is reliable and has good sealing properties.

[Brief description of the drawings]

FIG. 1 is a front view of a temperature expansion valve of the present invention.

FIG. 2 is a left side view of the temperature expansion valve of the present invention.

FIG. 3 is a right side view of the temperature expansion valve of the present invention.

FIG. 4 is a rear view of the thermal expansion valve of the present invention.

FIG. 5 is a top view of the temperature expansion valve of the present invention.

FIG. 6 is a bottom view of the thermal expansion valve of the present invention.

FIG. 7 is a front view of the temperature expansion valve to which a cover is attached.

FIG. 8 is a left side view of the temperature expansion valve to which a cover is attached.

FIG. 9 is a right side view of the temperature expansion valve with a cover attached.

FIG. 10 is a rear view of the thermal expansion valve with a cover attached.

FIG. 11 is a top view of the thermal expansion valve with a cover attached.

FIG. 12 is a bottom view of the thermal expansion valve with a cover attached.

FIG. 13 is a perspective view of a cover of the temperature expansion valve.

FIG. 14 is a side view showing a mounted state of the temperature expansion valve of the present invention.

FIG. 15 is a front view showing a mounted state of the temperature expansion valve of the present invention.

FIG. 16 is a front view of a temperature expansion valve showing another embodiment of the present invention.

FIG. 17 is a left side view of a temperature expansion valve showing another embodiment of the present invention.

FIG. 18 is a right side view of a temperature expansion valve showing another embodiment of the present invention.

FIG. 19 is a rear view of a temperature expansion valve showing another embodiment of the present invention.

FIG. 20 is a top view of a temperature expansion valve showing another embodiment of the present invention.

FIG. 21 is a bottom view of a temperature expansion valve showing another embodiment of the present invention.

FIG. 22 is a perspective view of a cover of the temperature expansion valve.

FIG. 23 is a perspective view of a cover of the temperature expansion valve.

FIG. 24 is a side view showing a mounting state of a conventional temperature expansion valve.

FIG. 25 is a front view showing a mounting state of a conventional temperature expansion valve.

FIG. 26 is a longitudinal sectional view of a conventional thermal expansion valve.

FIG. 27 is a schematic perspective view showing another example of a conventional temperature expansion valve.

FIG. 28 is a sectional view showing another example of a conventional temperature expansion valve.

[Explanation of symbols]

 32 first passage 34 second passage 36 power element portion 36f temperature sensing rod 50 through hole 100 temperature expansion valve 110 valve body 112 parallel surface 114 taper surface 116 bottom surface 200 cover 210 taper portion 212 taper surface 220 head 221 recess 222 Curved surface

Claims (7)

[Claims] A valve body provided at an upper end of the valve body for driving a valve body in accordance with a displacement of a diaphragm; and a valve provided at a lower end of the valve body and provided at the valve body. And an adjusting screw for adjusting the pressing force of a spring for adjusting the opening, wherein the power element has a cover provided therearound, and the lower part of the valve body is formed as a tapered surface. Characteristic temperature expansion valve. 2. A first flow path through which the refrigerant sent to the evaporator passes and a second flow path through which the refrigerant sent from the evaporator passes are formed in the valve body, and are formed in the middle of the first flow path. The valve body disposed opposite the orifice is urged in the valve closing direction by a spring, and the second
In a temperature expansion valve, the valve element is urged in the valve opening direction via a rod by a power element that operates by sensing the temperature of the refrigerant passing through the flow path, thereby controlling the valve opening. A temperature expansion valve, comprising: a cover provided to surround the power element; and a lower part of the valve body where the spring is present is formed in a tapered surface. 3. The cover has a concave portion formed inside, a curved surface and a tapered surface connected to the curved surface formed outside, and the power element is accommodated in an upper concave portion, and the tapered surface is formed on the valve body. The thermal expansion valve according to claim 1, wherein the thermal expansion valve is provided substantially continuously on the tapered surface of the thermal expansion valve. 4. The thermal expansion valve according to claim 3, wherein the tapered surface of the valve body is formed substantially at the center of the entire height of the valve body. 5. The valve body according to claim 1, wherein the power element is provided from an upper surface to a substantially central portion of the entire height thereof.
3. The thermal expansion valve according to claim 1, wherein the thermal expansion valve is formed to have an outer shape composed of surfaces parallel to each other and a tapered surface tapering toward a bottom surface on which an adjusting screw is provided. 6. The thermal expansion valve according to claim 1, wherein the cover is integrally formed of a plastic material. 7. The cover according to claim 1, wherein the cover is formed of a plastic material in two parts.
The temperature expansion valve as described.